[time-nuts] Testing a LPRO RB

Ulrich Bangert df6jb at ulrich-bangert.de
Thu Feb 16 07:55:21 UTC 2012


Mark,

> John DuBois and I did 
> quite a bit of work to find a way to unwind the osc 
> parameters from the available unstabilized reported data 
> using SciLab on the log files,  but nothing seemed to work 
> reliably.

For some information on how to do that have a look at Analog Devices
application note AN-1002 and at the there mentioned US patent US 7,711,230.

Best regards
Ulrich Bangert

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Mark Sims
> Gesendet: Donnerstag, 16. Februar 2012 01:56
> An: time-nuts at febo.com
> Betreff: [time-nuts] Testing a LPRO RB
> 
> 
> 
> Lady Heather's osc drift rate calculation does assume that 
> the temperature has been stabilized.   John DuBois and I did 
> quite a bit of work to find a way to unwind the osc 
> parameters from the available unstabilized reported data 
> using SciLab on the log files,  but nothing seemed to work 
> reliably.   Generally the data analysis croaked because of 
> things like noise and matrix singularities.
> 
> Also,  if you do stabilize the temperature,  it is very easy 
> to get the osc tempco.   Just turn off the stabilization and 
> see how the osc drifts as it warms up. 		 	
>    		  
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